Songsync

Have a large iTunes Music library? Songsync is the best way to
sync your Apple Music library to Spotify, automatically.

Make the long, arduous process of manually combing through your iTunes library,
searching and adding a song on Spotify, and then having to repeat the steps
over and over again for each song you'd like to add a thing of the past.
Simply select which songs from your iTunes music library you'd like to sync
to Spotify and Songsync will handle the rest, so you can spend less time
organizing your music and more time listening to it.